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Kohlrausch's law is most useful for determining the LIMITING molar conductivity (Λ°m) of:
AStrong electrolytes (NaCl, KCl) by direct extrapolation
BPure water (which is nearly an insulator)
CWeak electrolytes (CH3COOH) via strong-electrolyte values
DSolid sodium chloride before dissolution
Answer & Solution
Correct answer: C. Weak electrolytes (CH3COOH) via strong-electrolyte values
For STRONG electrolytes, Λ°m comes from extrapolating Λm vs √c plot. For WEAK electrolytes (CH3COOH), the curve is too steep; Λ°m is calculated via Kohlrausch's law from Λ°m of strong electrolytes (e.g., CH3COONa + HCl − NaCl).
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